Hey country music fans, who wants to go to Las Vegas? Clear Channel and Ryan Seacrest announced the 2011 iHeartRadio Music Festival lineup this week, which includes country music's Carrie Underwood, Rascal Flatts and Kenny Chesney among a full list of star performers.

The two-day fest -- which has been dubbed "the biggest live music event in radio history" -- runs Friday, Sept. 23 and Saturday, Sept. 24 in Las Vegas, and works in conjunction with the launch of a brand-new iHeartRadio. In addition to the trio of huge country stars, the lineup also boasts Lady Gaga, Coldplay, Steven Tyler and Kelly Clarkson, to name a few. More performers will be announced in the coming months.

Tickets for the big event go on sale this Saturday, July 16, on Ticketmaster, but fans can also win their way to the 2011 iHeartRadio Music Fest by listening to the company's network stations. Because the event is being held in the fabulous MGM Grand Hotel, everyone is encouraged to book their rooms now for the first-of-its-kind fest. We can't wait!

Watch Ryan Seacrest Announce the 2011 iHeartRadio Music Festival Lineup